Solar Eclipse

Looking directly at the sun is unsafe except during the brief total
phase of a solar eclipse (“totality”), when the moon entirely blocks the
sun’s bright face, which will happen only within the narrow path of
totality (https://go.nasa.gov/2pC0lhe (link is external)).

The
only safe way to look directly at the uneclipsed or partially eclipsed
sun is through special-purpose solar filters, such as “eclipse glasses”
(example shown at left) or hand-held solar viewers. Homemade filters or
ordinary sunglasses, even very dark ones, are not safe for looking at
the sun; they transmit thousands of times too much sunlight.